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NIST-SIP Specific support for IMS headers contributed by Jose Miguel
Freitas (Aveiro University, Portugal) and  Alexandre Miguel Silva
Santos (PT Inovacau, Portugal).  It is not part of the JAIN-SIP 1.2
specification.  Questions about the IMS Support in NIST-SIP 1.2 can be
directed to  Miguel Feitas <a23875@gmail.com> or the NIST-SIP mailing
list. To acccess these headers you have to cast the HeaderFactory to
HeaderFactoryImpl.  This package has been contributed to the public 
domain.
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